Regarding the illustration of the cover.
That is a puzzle!
What beast is it?
The artist, btw, knew exactly what beast he intended to draw.
Yet it is hard to make out.
And some are absolutely sure that they can discern it.
And others are . . . puzzled . . .it slips through one's perception in such cloudy ways.
And would it make a difference if someone thought it was an eagle when it was a phoenix or a dragon or a hawk?